[issue19763] Make it easier to backport statistics to 2.7

[Antoine Pitrou]

Antoine Pitrou added the comment:

FWIW, I sympathize with Christian's goal here, since I'm gonna have to backport pathlib too :-)

However, I think the following changes do make the docstrings less readable:

-    >>> mean([1, 2, 3, 4, 4])
-    2.8
+    >>> mean([1, 2, 3, 4, 4]) == 2.8
+    True

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<http://bugs.python.org/issue19763>
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